centos6.2安装mongodb2.6
2014-07-10 15:19
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首先要先导入第三方类库FMdatabase
获得存放数据库文件的沙盒地址
+(NSString *)databaseFilePath{
NSArray *filePath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = [filePath objectAtIndex:0];
NSLog(@"%@",filePath);
NSString *dbFilePath = [documentPath stringByAppendingPathComponent:@"db.sqlite"];
return dbFilePath;
}
创建数据库的操作
+(void)creatDatabase{db = [[FMDatabasedatabaseWithPath:[selfdatabaseFilePath]] retain];}
创建表
+(void)creatTable{//先判断数据库是否存在,如果不存在,创建数据库if (!db) {
[selfcreatDatabase];
}
//判断数据库是否已经打开,如果没有打开,提示失败
if (![dbopen]) {
NSLog(@"数据库打开失败");
return;
}
//为数据库设置缓存,提高查询效率
[dbsetShouldCacheStatements:YES];
//判断数据库中是否已经存在这个表,如果不存在则创建该表
if(![dbtableExists:@"people"])
{
[db executeUpdate:@"CREATE TABLES people(people_id INTEGER PRIMARY KEY AUTOINCREAMENT, name TEXT, age INTEGER) "];
NSLog(@"创建完成");
}
}
增加表数据
+(void)insertPeople:(People *)aPeople{if (!db) {
[selfcreatDatabase];
}
if (![dbopen]) {
NSLog(@"数据库打开失败");
return;
}
[dbsetShouldCacheStatements:YES];
if(![dbtableExists:@"people"])
{
[selfcreatTable];
}
//以上操作与创建表是做的判断逻辑相同//现在表中查询有没有相同的元素,如果有,做修改操作
FMResultSet *rs = [dbexecuteQuery:@"select * from people where people_id = ?",[NSStringstringWithFormat:@"%d",aPeople.peopleID]];
if([rs next]) {
NSLog(@"dddddslsdkien");
[dbexecuteUpdate:@"update people set name = ?, age = ? where people_id = 1",aPeople.name,[NSStringstringWithFormat:@"%d",aPeople.age]];
}
//向数据库中插入一条数据
else{
[dbexecuteUpdate:@"INSERT INTO people (name, age) VALUES (?,?)",aPeople.name,[NSStringstringWithFormat:@"%d",aPeople.age]];
}
}
删除数据
+(void)deletePeopleByID:(int)ID{if (!db) {
[selfcreatDatabase];
}
if (![dbopen]) {
NSLog(@"数据库打开失败");
return;
}
[dbsetShouldCacheStatements:YES];
//判断表中是否有指定的数据, 如果没有则无删除的必要,直接return
if(![dbtableExists:@"people"])
{
return;
}
//删除操作
[db executeUpdate:@"delete from people where people_id = ?", [NSStringstringWithFormat:@"%d",ID]];
[dbclose];}
修改操作与增加操作的步骤一致
查询
+(NSArray *)getAllPeople{
if (!db) {
[selfcreatDatabase];
}
if (![dbopen]) {
NSLog(@"数据库打开失败");
return nil;
}
[dbsetShouldCacheStatements:YES];
if(![dbtableExists:@"people"])
{
return nil;
}
//定义一个可变数组,用来存放查询的结果,返回给调用者
NSMutableArray *peopleArray = [[NSMutableArrayalloc] initWithArray:0];//定义一个结果集,存放查询的数据
FMResultSet *rs = [dbexecuteQuery:@"select * from people"];//判断结果集中是否有数据,如果有则取出数据
while ([rs next]) {
People *aPeople = [[Peoplealloc] init];
aPeople.peopleID = [rs intForColumn:@"people_id"];
aPeople.name = [rs stringForColumn:@"name"];
aPeople.age = [rs intForColumn:@"age"];
//将查询到的数据放入数组中。
[peopleArray addObject:aPeople];}
return [peopleArray autorelease];}
获得存放数据库文件的沙盒地址
+(NSString *)databaseFilePath{
NSArray *filePath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = [filePath objectAtIndex:0];
NSLog(@"%@",filePath);
NSString *dbFilePath = [documentPath stringByAppendingPathComponent:@"db.sqlite"];
return dbFilePath;
}
创建数据库的操作
+(void)creatDatabase{db = [[FMDatabasedatabaseWithPath:[selfdatabaseFilePath]] retain];}
创建表
+(void)creatTable{//先判断数据库是否存在,如果不存在,创建数据库if (!db) {
[selfcreatDatabase];
}
//判断数据库是否已经打开,如果没有打开,提示失败
if (![dbopen]) {
NSLog(@"数据库打开失败");
return;
}
//为数据库设置缓存,提高查询效率
[dbsetShouldCacheStatements:YES];
//判断数据库中是否已经存在这个表,如果不存在则创建该表
if(![dbtableExists:@"people"])
{
[db executeUpdate:@"CREATE TABLES people(people_id INTEGER PRIMARY KEY AUTOINCREAMENT, name TEXT, age INTEGER) "];
NSLog(@"创建完成");
}
}
增加表数据
+(void)insertPeople:(People *)aPeople{if (!db) {
[selfcreatDatabase];
}
if (![dbopen]) {
NSLog(@"数据库打开失败");
return;
}
[dbsetShouldCacheStatements:YES];
if(![dbtableExists:@"people"])
{
[selfcreatTable];
}
//以上操作与创建表是做的判断逻辑相同//现在表中查询有没有相同的元素,如果有,做修改操作
FMResultSet *rs = [dbexecuteQuery:@"select * from people where people_id = ?",[NSStringstringWithFormat:@"%d",aPeople.peopleID]];
if([rs next]) {
NSLog(@"dddddslsdkien");
[dbexecuteUpdate:@"update people set name = ?, age = ? where people_id = 1",aPeople.name,[NSStringstringWithFormat:@"%d",aPeople.age]];
}
//向数据库中插入一条数据
else{
[dbexecuteUpdate:@"INSERT INTO people (name, age) VALUES (?,?)",aPeople.name,[NSStringstringWithFormat:@"%d",aPeople.age]];
}
}
删除数据
+(void)deletePeopleByID:(int)ID{if (!db) {
[selfcreatDatabase];
}
if (![dbopen]) {
NSLog(@"数据库打开失败");
return;
}
[dbsetShouldCacheStatements:YES];
//判断表中是否有指定的数据, 如果没有则无删除的必要,直接return
if(![dbtableExists:@"people"])
{
return;
}
//删除操作
[db executeUpdate:@"delete from people where people_id = ?", [NSStringstringWithFormat:@"%d",ID]];
[dbclose];}
修改操作与增加操作的步骤一致
查询
+(NSArray *)getAllPeople{
if (!db) {
[selfcreatDatabase];
}
if (![dbopen]) {
NSLog(@"数据库打开失败");
return nil;
}
[dbsetShouldCacheStatements:YES];
if(![dbtableExists:@"people"])
{
return nil;
}
//定义一个可变数组,用来存放查询的结果,返回给调用者
NSMutableArray *peopleArray = [[NSMutableArrayalloc] initWithArray:0];//定义一个结果集,存放查询的数据
FMResultSet *rs = [dbexecuteQuery:@"select * from people"];//判断结果集中是否有数据,如果有则取出数据
while ([rs next]) {
People *aPeople = [[Peoplealloc] init];
aPeople.peopleID = [rs intForColumn:@"people_id"];
aPeople.name = [rs stringForColumn:@"name"];
aPeople.age = [rs intForColumn:@"age"];
//将查询到的数据放入数组中。
[peopleArray addObject:aPeople];}
return [peopleArray autorelease];}
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